PostgreSQL 9.5 added skip locked to select for update to improve concurrency 
performance, but why not add it to update sql?
   this is an application case, some body will update a tuple at the same time, 
so the RT for waiter is big, I use function and select for update nowait or 
advisory lock , can improve concurrency , but it's not very pure for developer.

公益是一辈子的事,I'm Digoal,Just Do It.

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